Dear Tigist,
This sounds like such an interesting book, and I look forward to reading it in the future. This book reminds me a lot of I book I read late last year. The book is called Tattoos on the Heart by Greg Boyle. In his book he speaks of his nonprofit organization Homeboy Industries where he has helped rehabilitate thousands of gang members. In his book there are many people like Rosario who struggle to move forward with their lives after they leave gangs. If you really enjoyed The Barrio Kings you might also enjoy Tattoos on the Heart.